Tritium analysis of divertor tiles used in JET ITER-like wall campaigns by means of β-ray induced x-ray spectrometry

Y. Hatano, K. Yumizuru, S. Koivuranta, J. Likonen, M. Hara, M. Matsuyama, S. Masuzaki, M. Tokitani, N. Asakura, K. Isobe, T. Hayashi, A. Baron-Wiechec, A. Widdowson

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations

Abstract

Energy spectra of β-ray induced x-rays from divertor tiles used in ITER-like wall campaigns of the Joint European Torus were measured to examine tritium (T) penetration into tungsten (W) layers. The penetration depth of T evaluated from the intensity ratio of W(Lα) x-rays to W(Mα) x-rays showed clear correlation with poloidal position; the penetration depth at the upper divertor region reached several micrometers, while that at the lower divertor region was less than 500 nm. The deep penetration at the upper part was ascribed to the implantation of high energy T produced by DD fusion reactions. The poloidal distribution of total x-ray intensity indicated higher T retention in the inboard side than the outboard side of the divertor region.

Original languageEnglish
Article number014014
JournalPhysica Scripta
Volume2017
Issue numberT170
DOIs
StatePublished - 1 Dec 2017
Externally publishedYes
Event16th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2017 - Neuss/Dusseldorf, Germany
Duration: 16 May 201719 May 2017

Keywords

  • divertor
  • implantation
  • Joint European Torus
  • nuclear fusion
  • retention
  • tritium
  • tungsten

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